Image Stabilisation differs a lot from a lens to another

I have the EM5 mark II with the Oly 9-18mm, the Pan 42.5mm and the pan 35-200mm (the tiny one).

I have done a lot of videos with mostly the 9-18mm. I thought the IS was doing a decent job but I was never really blown away by it.
I have always noticed that the pan 42.5mm was doing a better job but the focal lens was awkward to use for walking in the streets

Recently I got to try the M.ZUIKO DIGITAL 14-42mm 1:3.5-5.6 II R which is a kit lens and OOHH BOy it blew my mind.

The 5 axis stabilisation is so much better than I ever was able to accomplish with the 9-18mm.
The videos are Amazing and I kinda wish my wide angle would be the same.

I am not sure if it is the construction of the lens or the focal lens that really improves the stabilisation.

I did test with both lenses at 12mm and the kit lens looks smoother.

It makes sens that the stabilisation is weaker a long range, but also at the wide end?